code: def _log_deprecated(keys):
      # only run this once per session
      message = "%s config option%s unsupported"
      paths = ", ".join(f"'feature.{key}'" for key in keys)
      pluralize = " is" if len(keys) == 1 else "s are"
      logger.warning(message, paths, pluralize)
  
file_path: dvc/dvc/config_schema.py
imports: import os
  from urllib.parse import urlparse
  from funcy import once, walk_values
  from voluptuous import REMOVE_EXTRA, All, Any, Coerce, Exclusive, Invalid, Lower, Optional, Range, Schema
  from dvc.log import logger
label_desc: Use image node_id 2 for calling the FeatureSchema obj's underlying member method code with example usage: obj._log_deprecated(keys) without return types